fraud – My bitcoin transaction was confirmed however recipient claims they haven’t acquired it

I despatched a cost to recipient bc1qr06w3lxxv5chvgyr54z957324dgels2g5fa0jc

And it’s confirmed. Nonetheless, they’re claiming they haven’t acquired it and mentioned I ought to resend the quantity and I’ll get the preliminary cost again.

How can I inform if they really acquired it?

If I ship a replica quantity, how will I get my unique cost refunded?

Is that this a rip-off?